China stretches the imagination with world's longest sea bridgeChina today announced it had begun construction of the world's longest sea bridge – barely 18 months after opening the current record-holder.

The Y-shaped link between Hong Kong, Macau and China will be around 50km (31 miles) long in total, 35km of which will span the sea, said the state news agency Xinhua. Due to be completed by 2015, the 73bn yuan (£6.75bn) cost of the bridge will be shared by the authorities in the three territories.

The structure also includes a 5.5km underwater tunnel with artificial islands to join it to bridges on each side. According to the engineering group Arup – which has helped with the design – it is the first major marine bridge-and-tunnel project in China. But the engineering firm described the structure as 38km in length; the reason for the disparity was unclear...